Nginx and containers

General
1

We currently have 3 Container Instances
1 Login UI – Angular Application with its own NGINX server configure in the Docker Image
2 HD UI - Angular Application with its own NGINX server configure in the Docker Image
3 API - .Net Core restful API

We are expecting to have a Wildcard certificate to be utilized.

We are encounter a problem when a user requested a Specific URL in the HD UI and they are not logged in and the application needs to redirect, the expected behavior is:

  1. User requested a Specific URL in HD UI.
  2. Application determines the user is not logged n and redirects the user to Login UI.
  3. User authenticates.
  4. Application redirects the user back to the Specific URL in HD UI.

We believe that with this design and we will need a 4th NGINX server Container that will be in charge of redirecting the specific URLs accordingly to the users desire destination:
Login UI, HD UI, or API.

Is having 3 NGINX server the best approach?
What are the best practices in order to achieve the expected behavior described?
How can we set up this environment on AWS?